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	Effects of mixture of branch order-based roots and nitrogen addition on root decay in a subtropical pine plantation
	Kou L.; Chen, W. W.; Gao, W. L.; Yang, H.; Wang, H. M.; Li, S. G.
	2015
关键词	Decomposition Root branching order Mixing effect Acid-unhydrolyzable residue Nitrogen addition litter decomposition leaf-litter chinese temperate forest litter diversity soil ecosystem architecture heterogeneity availability
英文摘要	Non-additive effects may occur when branching order-based fine roots decompose in mixture, due to their distinct chemical composition. However, these effects and how they respond to increased nitrogen (N) availability are poorly known. We conducted a 524-day field litterbag experiment to examine the potential non-additive effects of order-based fine root decomposition and their responses to different rates of N addition in a Pinus elliottii (slash pine) plantation in China. The intact fine roots of slash pine trees were hierarchically dissected and split into two groups (lower-order roots (the first and second order roots) and higher-order roots (the third to fifth order roots)). The decomposition of these two root groups was monitored either separately or in 1:1 mixture. The non-additive effects did not occur when the two root groups decomposed in mixture. However, high rate of N addition shifted the root group interactions from additive to synergistic effects through contrasting effects on individual root group (lower-order roots). High rate of N addition retarded the decomposition of lower-order roots more in isolation than in mixture, due to the decreased binding of acid-unhydrolyzable residue to inorganic N ions in mixture. Therefore, we suggest that although stoichiometric heterogeneity holds within the branching hierarchy of fine roots, the tight coupling of N with acid-unhydrolyzable residue of root tissues may limit N use by microdecomposers, and thereby causing the additive effect. Since the mixing effect of order-based root decomposition is affected by N addition, understanding the chemical heterogeneity within fine root systems and their linkage with ambient N availability during decomposition either in isolation or in mixture may facilitate the accurate prediction of root decomposition responses to N loading.
出处	Biology and Fertility of Soils
卷	51
期	8
页	947-957
收录类别	SCI
语种	英语
ISSN号	0178-2762
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/38682]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Kou L.,Chen, W. W.,Gao, W. L.,et al. Effects of mixture of branch order-based roots and nitrogen addition on root decay in a subtropical pine plantation. 2015.

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